Display device



May 26, 1925.

y 1,538,899- R. M. LANGLEY ET AL 'DISPLAYDEVICE meq June 19, 1922 sSh'e'etS ISheQt 1 May .26, 1925.

R. M. LANGLEY ET AL DISPLAY DEVICE,

Filed June 19. 1922 I 3 Shets$heet 2 l nvenfors Raymond M. LangleyaPbilipp G Graf By Wad/w;

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R. LANGLEY ET AL DISPLAY DEVICE Eile d June 3 Sheets-Sheet 3 v//////////V///A?///// \nven-for's aymond M Lqhglez/ qPhili @(firaj,

Patented May 26, 1925.

' UNITED STATES PATENT OFFICE.

RAYMOND M. LA GLEY AND PHILIP a. GRAF, on CHICAGO, ILLINOIS, ASSIGNORS,BY

MESNE ASSIGNMENTS, TO THE Hoover. COMPANY, or NORTH cANroN, 01110, A

CORPORATION OF OHIO.

DISPLAY nnvrcn.

Application filed June 19, 1922 Serial No. 569,345.

To all whom it may concern:

Be it known that we, RAYMOND M. LANG- LEY and PHILIP G. GRAF, citizensof the United States, and residents of Chicago, county of Cook, State ofIllinois, have invented certain new and useful Improvements in DisplayDevices, of which the fol-' lowlng is'a specification.

, This invention relates in general to display-devices and in particularto a device adapted to display and demonstrate suctioncleaners, and hasfor an object, the provision of means whereby the action ofsuction-cleaners and their effects on floor coverings can be studied andexamined under conditions closely approximating normal.

Another object of this invention is to provide a device fordemonstrating suctioncleaners so designed that the path of the machineover the floor covering is automati cally changed after each to-and-fromovement.

The invention is illustrated in the accompanying sheets of drawings inwhich like reference characters refer to the same parts.

In these drawings:

Figure 1 is a side-elevation of a demonstrating device forsuction-cleaners embodying our invention;

Figure 2 is a plan view of the same with parts shown in dotted lines;

Figure 3 is a detail View of part of the operating mechanism; and

Figure 4 is a detail view of the cam forming part of the operatingmechanism.

Figure 5 is a sectional view taken on line :n-w of Figure 3 showing themechanism for operating the movable platform.

The various novel features of the invention will be apparent from thefollowing description and drawings and will be particularly pointed outin the appended claims.

In the embodiment of our invention illustrated in the drawings, thedisplay-device comprises generally a stationary table or platform and asecond table or platform having the same height and which is capable of-movement relative to the first table.

- It, of course, will be understood that either one of the tables couldbe movable. The stationary table is formed with a top 10 which forms asupport for a section of floorcovering 11 and is supported by front andtherein a plate of glass or other rear members 12 and 13 respectively.Forward ofthe section-offloor-covering at the point where thesuction-cleaner reverses its direction at the end of the forward stroke,the top 10 1s aperturedrand has embedded substance 14, the top surfaceof which is flush w1th the uppersurfaceof the floor covering.

y In order that theunderside of the machine being demonstrated may beconveniently observed when it is at the end of its I forward stroke andresting upon the plate of glass 14, a mirror 15 is pivotally mounted onpins 16 supported by brackets 17 extending forwardly from the front legs12 of the stationary table 10. To provide proper illumination, a lamp 18is mounted upon each of the brackets, which also support a.

combined shield and reflector 19. These lamps are adapted to beconnected with any convenient source'ofpower and are controlled by aswitch 20 mounted on the side of the table.

. To the rear of the stationary table and secured to the legs thereof bymeans of hinges 21 is a platform 22provided with parallel tracks 23.This platform is adapt ed to be folded into a vertical position againstthe legs 13 in order tolmake the device portable. Further, the twotables are so proportioned that one may be nested within the other, thusallowing the device to be packed in a minimum amount of space.

Resting on the platform 22 and movable thereon is a table consisting ofa top por tion 24 and supporting legs 25, each of which has attachedthereto a flanged-wheel 26 adapted to travel on the tracks Mounted onthelegs 25 at the sides of the movable table are cross-pieces 27 uponwhich rest the members 28 and 29 forming a supporting platform for anelectric motor 30 which is provided with a vertical-shaft 31. Thisshaftcarries a pulley 32 and a cenrlfugal governor 33 which co-acts witha fixed plate 34 to regulate the speed ofthe,

To the vertical shaft 36 of the reduction gearing" is secured a pulley37 over which transparent is trained a belt 38 connecting with thepulley 32.

Fixed to the worm-wheel shaft 39 of the reduction gearing is a crank-arm40 to the outer end of which is pivotally connected a link 41 the otherend of which is pivotally connected to a pin 42 mounted in the end ofthe rocker-arm 43 which is pivotally mounted at 44 in brackets 45supported by the movable table and extending through a slot formed inthe top 24. To provide clearance for the dust-bag of the suctioncleanerbeing operated when it is at the end of its backward travel, therocker-arm is bent as at 46.

On the end of the handle 47 of the suction-cleaner 47 being operated, abi-fured, a bracket 51 formed with a camgroove 52 is mounted on the endof the rockerarm. Co-acting with this cam-groove is a pin 53 secured tothe free end of the actuating lever 54 of the counting mechanism.

In order to closely simulate the conditions and operations of actualcleaning the movable table is given a slight lateral movement at the endof each rearward stroke of the cleaner at which time the cleaner isresting upon the movable table and is accordingly moved with it. Thecleaner therefore, moves on a slightly different path over thefioor-covering upon each reciprocation.

This lateral movement of the movable top is provided by the followingmechanism:

. To the under sidevof the top 24 of the movable table are securedtwospaced depending stud-shafts 55 and 56 on which are rotatably mountedthe sprocket-wheels 57 and 58, respectively, over which is trained theendless sprocket-chain 59. Secured to the sprocket-chain at one pointalong its length is a cam-follower 60.

Keyed to the hub of the sprocket-wheel 57 is a ratchet-wheel 61 which isactuated by a pawl 62 pivotally mounted on a lever 63 by means of thescrew 64 and is prevented from retrograde movement by a spring-pressedpawl 62. This pawl is normally -ma1nta1ned in engagement with theratchet-wheel by means of a spring 65, one

end of which is secured to the lever 63 by the screw 66 and theintermediate portion.

anchored by means of a screw 67; The lever 63 is fulcrumed at one end onthe hub of the sprocket-wheel .57 and is pivotally connected at theother end 68 to a link 68 which in turn is pivotally connected to alever 69 fulcrumed in a bracket 70 secured to the table-top. The lever69 in turn is pivotally connected to a link 71, the other end of whichis provided with an elongated slot 72 which receives the pin 42. Thisslot is ofsuch a length that the pin 42 does not impart any motion tothe link 71 until the suction cleaner is at the end of its rearwardstroke and is resting on the movable top.

To co-act with the cam-follower 60 and thus give a lateral movement tothe movable table, a cam-block 72 is mounted on brackets 73 extendingrearwardly from the legs 13 of the stationary table. In the camblock isformed a cam-groove 74 approximately diamond-shaped which receives thecam follower 60. n

. To prevent the cam-follower when it is situated on that part of thechain which forms a tangent between the two sprocketwheels, fromclimbing up the mechanical face of the cam-groove, pockets 75, 75 areplaced at each end of the major axis which present faces normal to thedirection of travel of the cam-follower. At the ends of its minor axisthe cam-groove is formed with inwardly-bent portions 7 6, 76, whichreceive the, cam-follower when it is positioned on the circumference ofone or the other sprocket-wheels. By this arrangement the dwell thatwould otherwise occur at this point is eliminated and a uniformstep-by-step motion is given to the movable table throughout itsexcursion of travel.

The forward part of the top of the movabl table is covered with asection 77 of resilient and sound-deadening material such as rubber,upon which the suction-cleaner rests at the end of its rearward travelduring which time the lateral movement takes place.

In the operation of the device a section of carpet is secured to the topof the stationary-table and a suction-cleaner placed thereon with itshandle connected to the rocker-arm 43. The lights are then turned on andthe mirror 15 adjusted so that observers standing in front of themachine can see the reflection of the lower side of the machine throughthe glass-plate 14.

When the motor circuit is closed the suction-cleaner is reciprocated bythe rockerarm 43 and the transmission-mechanism connecting it with themotor. At th end of each forward stroke of the cleaner, there is amomentary dwell which takes place upon the glass-plate and allows anopportunity for observers to watch the action of the moving parts withinthe suction-nozzle.

During the rearward travel the cleaner passes from the section offlOOPCOVBIlDg to the section of rubber on the movable table where theend of the stroke occurs. During the movable table the pin 42 reachesthe end of the slot 72 and causes the table moving mechanism to operate.This movement of the table causes the cleaner carried by it to betransported laterally and thus causes the next to-and-fro stroke of thecleaner to be made over a different path on the floorcovering.

6 claim:

1. A display-device comprising a stationary platform, a movable platformprovided with a mechanism adapted to reciprocate a suction-cleaner, andmeans to shift the movable platform relative to the stationary platform.

2. A display-device comprising a stationary platform, a movableplatform, means to reciprocate a machine being displayed over a pathpartly on each of said platforms, and means to move one platformrelative to the other.

3. A display-device comprising a stationary platform, a movableplatform, means to reciprocate a machine being displayed over a pathpartly on each of said platforms, and means to move one platformrelative to the other while the machine being displayed rests solelyupon one of the platforms.

4. A display-device for suction-cleaners comprising a mechanism adaptedto reciprocate the cleaner along a series of parallel paths and to shiftthe machine laterally when it is at the end of a reciprocation.

5. A mechanical device for operating suction-cleaners comprising asupport for floor coverings, means to impart a to-and-fro movement tothe suction cleaner over the floor covering, and means for shifting thepath of the suction-cleaner over the floor covering at the end of eachto-and-fro movement.

6. A display-device comprising a stationary platform, a movableplatform, means to reciprocate a machine being displayed over a pathpartly on each of said platforms, and means to move one platformrelative to the other, one of said platforms being provided with atransparent section upon which the machine being displayed rests at theend of each reciprocation.

7. A display-device comprising a stationary platform, a movableplatform, means to reciprocate a machine being displayed over a pathpartly on each of said played, means to observe the underside of themachine at one end of the reciprocation,

and means to shift said machine laterally at the other end of itstravel.

9. A display-device comprising a stationary platform, a movableplatform, means to reciprocate a machine being dis played, means toobserve the underside of the machine at one end of the reciprocation,and means actuated by said reciprocating mechanism to shift saidmachine'laterally at the other end of its travel.

10. A display-device for suction-cleaners or the like comprising asupporting structure, means to reciprocate the suctioncleaner over apath on said supporting structure, one end of said path being composedof transparent material, the mid-section of fabric floor-covering andthe other end of sound-deadening material.

11. A display-device for suction-cleaners or the like, comprising asupporting struc ture, a section of floor covering carried by saidsupporting structure, and means adapted to reciprocate a suction-cleanerover a path which lies across said section of floorcovering and extendsa substantial distance on each side thereof.

12. A display-device comprising a stationary platform, a movableplatform provided with a mechanism adapted to reciprocate asuction-cleaner, and means to shift the movable platform relative to thestationary platform, said means comprising a cam member carried by thestationary platform, a cam follower carried by the movable platform, andmeans to give a step-bystep motion to the cam follower at the end ofeach reciprocation.

Signed this 29th day of May A. D. 1922.

RAYMOND M. LANGLEY. PHILIP G. GRAF.

